Responses
The planets had a significant stellar parallax.
The planets had a significant stellar parallax.
The planets were attached to crystalline surfaces.
The planets were attached to crystalline surfaces.
The planets were fixed to nested spheres.
The planets were fixed to nested spheres.
The planets spun on epicycles.
1 answer
The correct response is: The planets spun on epicycles.
Ptolemy's geocentric model explained the apparent changes in speed and direction of the planets by proposing that they moved in small circles called epicycles, which in turn moved along larger circular orbits (deferents) around the Earth. This system helped to account for the observed retrograde motion of the planets.
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